Abstract: Through researches on energy flow and economic flow of 6 different models of homegardens in Sanjia Village, it is discovered that the energy inputs of the 6 models range between(98.48～174.45)×10 ¹⁰ J·hm ^-2 ,the energy outputs between(101.66～158.52)×10 ¹⁰ J·hm ^-2 and the output/input ratios between(0.88～1.41)∶1.The ratio is higher with crop cultivation based models of homegarden(models Ⅰ and Ⅱ) than with models dominated by animal husbandry and sideline(models Ⅵ,Ⅶ and Ⅸ).It is also found that the economic output/input ratios of the 6 models of homegardens range between(1.00～1.35)∶1,showing an increasing order of model Ⅵ>Ⅶ>Ⅰ>Ⅱ>Ⅴ>Ⅸ and that their economic outputs range between 2 327.9～9 803.4 RMB Yuan.It can,therefore,be inferred that the homegarden system of Sanjia Village is an artificial ecosystem of high energy and economic input and output.

Key words: homegarden system, energy flow, economic flow, Simao City