With the large application of agricultural plastic film, the residual of plastic film was continuously increased in soil during the last few decades. The application of biodegradable film could solve the environmental pollution because of its totally degradable property. Agricultural film was specially required in arid and cold region, so it was very important to study and get the suitable degradable film for sustainable agricultural development. Five treatments including plastic film, biodegradable film (thickness 0.012mm), biodegradable film (thickness 0.008mm), liquid film and no film (CK) were used to compare the effects of different types of film on soil temperature, soil water potential, crop growth and yield. The results showed that there were no significant differences between plastic film and biodegradable film treatments during early crop growing period (June and July), whereas the soil temperature in 0~20cm soil layer for the treatments of biodegradable film was a little lower than plastic film treatment because of film’s degradation, especially for the treatment of biodegradable film of thickness 0.008mm during the end of crop growth. However, the soil temperatures of liquid film and no film treatments were obviously lower than plastic film treatment. The results for soil water potential among different treatments were similar, and it was very close between plastic film and biodegradable film treatments, but the maximum soil water potential was shown in 0~20cm soil layer during the end of September, and there was significant difference between plastic film and biodegradable film treatments (p<0.05). No significant differences were found between plastic film and biodegradable film treatments for the crop height, leaf area index (LAI), dry matter of leaf, stem, flower dish and yield. However, both of these two treatments were clearly better than liquid film and no film treatments. Thus, it was feasible to replace plastic film with biodegradable film for mulching in arid and cold region.