The invention relates to an inspection method, in particular to an inspection method of correctness of opening degree of an accelerator of a speed controller of a diesel engine. The method comprises following steps of step 1, adding a current transmitter; step 2, achieving monitoring of actual output of the speed controller; step 3, adding an accelerator opening degree feedback device; step 4, achieving monitoring of actual opening degree of the accelerator; step 5, carrying out fault inspection when the diesel engine is not normally started after a startup command is received; step 6, mainlyinspecting faults of an accelerator driving device and an accelerator machinery device; and step 7, mainly inspecting faults in other aspects. According to the invention, when the diesel engine is notsuccessively started, correctness of actions of the speed controller can be vividly and efficiently judged; by carrying out the inspection by use of the method, inspection time of startup failure ofthe diesel engine is greatly shortened and unusable time of a diesel engine system is reduced; and the novel inspection method is provided for nuclear power stations.