This paper describes method supervisor synthesis for certainly structured type of DES. This DES type has the following features: object model is represented as a set of automata and common DES alphabet is extended with new event type called expected. Language model of generator is presented by alphabet of controllable and expected events, and language model of specification is presented by alphabet of controllable and uncontrollable events. Thus assignment of the alphabets gives compact specification. Designed method synthesizes the supervisor with linear dependence of complexity on source data amount.