A test was carried out to identify the resistance to P.capsici of 29 samples,and the enzyme actvity of squash materials with different resistance was analyzed.The results showed that:in healthy plants,there is not significant difference of POD and PPO activity between resistant and susceptibl materials.After infection,there is a bigger increase of POD activity in susceptible mate-rials than that in resistant materials;but there is a bigger increase of PPO activity in resistant mate-rials than that in susceptible materials.After inoculation,POD and PPO activity of resistant mate-rials are higher than that of susceptible materials,which are related positively to disease resistance.