The survey data collected from individual investors indicate that about 46 percent of investors reported they felt happy from the investment in stock market. The overall happiness of life, age, investment return, and the amount of investment directly affect the well-being of investors from investment. The happier people consider themselves in general life， the more happiness they can get from their investment. There is an U-shape relationship between the investors' age and their happiness in investment. Both young and old investors get more happiness than middleaged investors. Long-run rather than short-run investment return has a positive effect on happiness. The relative amount of investment compared with the total family asset is positively associated with the investment happiness, while the absolute amount of investment is negatively associated with the happiness. In addition, cognitive bias, investment objectives, personality and other related factors can affect the investment return or the overall happiness in life, and they can indirectly affect the happiness in investment.