This paper adopts potato starch as the raw material,adding different auxiliary agents made into the film Fresh keeping agent,at normal temperature of cucumber on film preservation,periodically cucumber physiological and biochemical indexes,which can get the potato starch of cucumber Fresh keeping agent film the best effective formula,through to the potato single factor experiment,the results of their study:the effect of cucumber sa fresh preservation ratio for the best in 100mL water calcium chloride 5g,glycerin lmL,potato starch is 4g,sodium alginate 2g,get the cucumber water loss rate lowest,hardness keeps best and Vc content is the highest.