This study relates to a crack repair techniques in the concrete structure. In order to develop repair material containing self-healing agents, smart repair methods were investigated. For the micro cracks of less than 0.3 ㎜, new repair method of surface treatment was suggested by the simple crack repair stick. In case of over 0.3 ㎜ cracks, injection method using inorganic materials was suggested for drying shrinkage and water leakage.