Abstract: Economic equality, authoritative status of constitution, healthy political party system and good political culture are the basic premise of democracy. Democracy without these four factors, can hardly reach the expected outcome. Democracy in Thailand is just such a case. Since Thailand established constitutional monarchy in 1932, Thailand has gotten the basic political structures of democracy. However, without these four factors, Thailand's politics is always accompanied by chaos and unrest. The specific reasons are as follows: firstly, bipolar economic development causes election's dilemma; secondly, the constitution is not powerful enough; thirdly, both political party and political party system are unstable; fourthly, Thailand lacks of appropriate political culture. Hence, Thailand has to cultivate these four factors as soon as possible in order to make its democracy work well.