To optimize the preparation conditions of porous starch The porous starch was used to powder coix seed oil. Porous starch was made of maize starch by using compound enzymes of glucoamylase and alpha-amylase. The preparation process was optimized through orthogonal test design with oil absorption rate to salad oil as indexes. The effect of different dosages of porous starch on yield of triglyceride by powdering coix seed oil was studied. The triglyceride release behaviors and fluidity of powdered coix seed oil were also studied. The results showed that the optimum conditions for preparation of porous maize starch were as follows, the mass radio of glucoamylase to a-amylase was 3:1, the temperatures was 55 degrees C, pH was 5.0, and hydrolysis time was 12 h. Under these conditions, the oil absorption rate to salad oil was 98.5% for porous maize starch. Porous starch was used to power coix seed oil. When porous starch to coix seed oil was 4:1, the triglyceride yield of powering coix seed oil was up to 97.02%. The fluidity of powdered coix seed oil was favorable and control released. The preparation of powdered liquid oil with porous starch had many advantages such as simple production technology, convenient operation, low cost and was worth generalizing.