The precise way in which the practice of Falun Dafa works to heal illness is not fully understood by modern science, but its effects can be measured through scientific study.

A Chinese government census taken in 1998 indicated hat 70 to 100 million people were practicing Falun Dafa in China alone. This made Falun Dafa by far the most popular qigong practice in China's history. Many practitioners testified from their personal experience that Falun Dafa had powerful healing properties. In 1998, the first major health survey was conducted on Falun Dafa practitioners in Beijing.

According to the survey, out of 12,731 participants, 93.4% initially had conditions of illness, and 49.8% had suffered from at least three diseases before they began practicing Falun Dafa. Through learning and practicing Falun Dafa, the practitioners' health improved in various degrees. The effectiveness rate of cases reached 99.1%, and among these, the rate of complete recovery was 58.5%. Comparing practitioners' health before and after practicing Falun Dafa, 80.3% of the participants reported improvements. Among these people, the percentage of people reporting that they felt “very energetic” increased from 3.5% before practicing o 55.3% after practicing. These numbers demonstrate that Falun Dafa is remarkably effective in curing diseases, increasing energy and improving one's overall sense of well being. Being healthy includes having both a healthy body and a healthy mind. The survey demonstrated that 12,287 people, or 96.5% of the participants, felt healthier psychologically after practicing Falun Dafa.

The Beijing survey indicated that the number of people practicing Falun Dafa increased every year, with the growth rate also becoming more rapid. The fact that Falun Dafa attracted such a great number of practitioners in such a short time provides further evidence that Falun Dafa is indeed effective in healing illnesses and improving health.

According to the survey, Falun Dafa practitioners saved 3,270 yuan of medical expenses per person per year for the state. (Yuan is Chinese currency. The average worker in Chinese cities makes around 500 yuan per month.) Multiplying this figure by the millions of people practicing, one can easily see that Falun Dafa saved China a tremendous amount of money in medical costs and resources. This is one of the reasons why Falun Dafa has been widely regarded as being beneficial, not just for individuals, but also for society as a whole.

A survey was also conducted in Taiwan. Out of 1,182 participants, 72% of Falun Dafa practitioners used only one health insurance card, which allows the recipient 6 visits to health care providers, per year, a reduction in usage of almost 50% compared to the general population. The report also pointed out that Falun Dafa has a remarkable effect on eliminating unhealthy habits and addictions. The study showed an 81% success rate for quitting smoking, 77% for abstaining from alcohol, and 85% for quitting gambling.