Which is better for your health: fresh, frozen or canned fruits and vegetables? The answer is: Any and all.
Canned fruits and vegetables often are considered nutritionally inferior to their fresh and frozen counterparts. While this may be true regarding sugar and salt content, it's not true when it comes to other nutrients. In fact, in a recent study completed at the University of Illinois, many of the canned fruits and vegetables evaluated contained as much or more of certain nutrients than their fresh and frozen counterparts.
For example, most brands of canned apricots, spinach and pumpkin provided more vitamin A per serving than their fresh- cooked counterparts. Also, canned asparagus, potatoes and spinach tended to outrank or equal fresh-cooked varieties for vitamin C. On the other hand, fresh-cooked tomatoes tended to be higher in vitamin C and fresh-cooked carrots higher in vitamin A per serving than canned or frozen types.
One reason canned (and frozen) fruits and vegetables sometimes rank nutritionally superior to fresh produce is they're usually processed immediately after harvest, when nutrient content is at its peak. This is especially true when it comes to the vitamin C found in green vegetables. The longer a green vegetable sits on a truck or in the supermarket, the lower its vitamin C content. Because they are more acidic, fresh (as well as frozen and canned) fruits are less susceptible to loss of vitamin C during storage.
This is not to say there aren't downsides to eating canned versus fresh and frozen products. Canned vegetables are notoriously high in sodium and canned fruits packed in syrup are high in sugar. However, with the growing popularity of low sodium and low sugar versions of products, most manufacturers now offer low-sodium and salt-free versions of their canned vegetables. In addition, juice-packed fruits generally are available at a cost similar to fruits packed in syrup.
The other downside is taste. Many fruit and vegetable lovers simply prefer the taste, texture and look of fresh and fresh-cooked produce. Canned and fresh-cooked green beans simply are not the same product. Nor are canned, frozen and fresh- cooked corn.
Still, the University of Illinois study underscores a message nutritionists have long emphasized: canned and frozen produce is a nutritionally sound alternative to fresh fruits and veggies. Frozen and canned products are particularly good to have on hand for times when you can't get to the store for fresh products or when fresh fruits and vegetables are out of season or out of your price range.

By Pat Kendall, Ph.D., R.D.
Food Science and Human Nutrition Specialist
Colorado State University Extension, January 22, 1997

18th July,Reporter knew a news from Weihai Quality and Technique Supervision Bureau,In the first year of 2007, the Bureau supervised and checked terminaly for 207 factories of making food, total checked 305 multi-batches for 28 kinds foods,qualifacation foods was 273 multi-batches,the qualified rate was 89.5%.
For Edible vegetable oil,canned foods,beer,candy,meat products,frezzing foods etc.,had better quality,the qualified rate was more than 95%.Cake and drinking water were about 90%.Aquatic product was only 66.7%,the mainly reasons were that exceeded the limits for moisture and salinity.

sources:Sina.com.cn

In the recent years,the canned foods factories have been notable in regeonal difference by raw materials supplying.
The experts think that the Regionalization take canned foods factories to be in local industry,not only Pull local economic growth,but also promote developments of the agricultural products and industrialization.
At present,The major production zones of canned fish are in coastal areas,such as Guangdong,Fujian,Zhejiang,Shandong,Liaoning. Canned meats are in Shanghai,Fujian,Sicun.Canned fruits are in Shandong,Zhejiang,Hebei,Fujian etc..Canned mushroom and asparagus are in Shandong ,Fujian and Yunnan.Tomato jam is in Xinjiang.

In processing of makeing all kinds of canned fruits for our company,haven't added in any anticorrosive of fresh-keeping,and depend on sealing and sterilizing to get sterile canned fruits.The canned fruits haven't deteriorated under the sterile state for very long time

The nutrition and smell of canned fruits are better than fresh fruits.For the canned
cherry,canned grape,canned apple,canned pineapple etc.,not only can be keeped in store fro long time,but also have better colour and lustre and taste.
The Sales of China canned fruits had millions tons,The majority of canned cherry and canned grape,have made from China in the World.

Junlide Co. have produced canned grape without skin & seeds since 1996,the the canned grapes had reached high-class products in the world and gotten wide welcome in Janpan,Russia,US. etc..
Since 1996,Junlide Co. have made canned grape,the exporting quantity have increased in successive years and the quantity have increased 2000 tons from 600 tons each year.
Junlide canned grapes have never happened any quality accident for 11 years. and have gotten the trust of all clients.