Hit judgement is essential factor in design for battle-style MMORPG game system and sets foundation for other game systems. Hit judgement model consists of attack power and attack rate. The former contains minimum, maximum, and critical attack, the latter has miss, hit, and critical blow rate. Random function generates one value of attack rate and consequently the damage is calculated. In this article, we propose hit judgement model which Is widely acceptable for generic MMORPG and describe the effort of applying the proposed model to Travia Online in detail.