The No. 1 and 2 roller screen and coal crusher of the Datang Zhuzhou Huayin 2 × 300 MW units frequently have such faults during operation as coal deposition, coal block, difficult start-up and motor burnout, which have seriously affected the safe operation of unit. An analysis is conducted on the fault causes of the roller screen and coal crusher and some improvement measures are proposed. After renovation, the equipment works well and can meet the production requirements.