Research on innovative methods for Conceptual Design of Control Strategies (CDCS) is of great theoretical and engineering meaning. In this paper, TRIZ-aided innovation in CDCS was proposed. At first, a systematic approach to build a new theory of inventive problem solving specialized for control strategies (TRIZ-CS) was proposed with its systemic structure was given. Then the Block-Signal analysis model (B-S analysis model) was proposed based on Su-Field analysis model in TRIZ with its symbol system and application procedure. Finally four examples were given to show the rationality of TRIZ-aided innovation in CDCS and effectiveness of B-S analysis model. The examples show that TRIZ-aided innovation is a systematic, effective and practical innovative methodology for CDCS.