活性催化剂通过五步处理后具有一种适合于催化剂制备和活化的晶状结构。五步处理：（１）与五价含钒化合物、五价含磷化合物在酒精介质中作用；（２）把Ｍｏ掺入到反应产物中，形成改性的Ｍｏ基固态单体；（３）除去酒精制成干燥的改性Ｍｏ基固态单体；（４）形成由干燥的改性 The active catalyst has a crystalline structure suitable for catalyst preparation and activation after five steps of treatment. Five steps: (1) with pentavalent vanadium compounds, pentavalent phosphorus compounds in the role of alcohol in the medium; (2) the Mo is incorporated into the reaction product to form a modified Mo-based solid monomer; (3) Removing alcohol to make dried modified Mo-based solid monomer; (4) forming by dry modification