This research explains that the company should be able to anticipate and face all conditions to be able to survive in order to win the business competition by maintaining the stability of the company to obtain maximum profit. The use of the influence of working capital increase or decrease from the performance of the company in terms of liquidity. The liquidity is a problem related to the ability of a company to meet the obligations of capability so it needed liquidity ratio analysis of working capital for intepreted short-term financial position. The purpose of this research is to know the use of working capital on the Indomobil Sukses International Tbk and its effectiveness in improving the liquidity in the period 2012-2014. This research is a descriptive quantitative research with processing the data obtained from the related documents research. The results of the study showed that the use of working capital with the analysis of liquidity ratio is good enough, while the effectiveness of the use of fluctuating working capital and tend to decline.