Since the 1972 Collision Regulations came into force, certain problems have been proposed by contracting countries about Rule 10 and Traffic Separation Schemes. Some of them were amended on last IMCO Assembly but there are many problems to solve. This paper proposes some suggestions to solve that problems concerned Rule 10 and T.S.S.. 1. Clarification of the word concerned Rule 10 and T.S.S., especially the definition of words being used in Rule 10, should be considered without delay. 2. T.S.S. should be reviewed in aspects on the application of Rule 10 including other Rules of 72 Collision Regulations and on the existing traffic patterns of traffic flow in the areas by reexaming traffic survey. As T.S.S. should be limitted to what is essential in the interests of safe navigation, inadequate T.S.S. for application of Rule 10 and conflicting with existing traffic pattern should be cancelled or revised. 3. Special navigation rule should be introduced on the some T.S.S. which could not control by Rule 10. That rule should be included obligation to use T.S.S., restriction on entering or leaving, or crossing T.S.S. and some privilege on the navigation rule for vessel using T.S.S. should be considered about some of T.S.S..