PURPOSE: AN effective cultivating method is provided to cultivate nutritious fresh water laver twice a year. CONSTITUTION: A culture solution is manufactured by mixing 3 to 5 parts by weight of leaf body of fresh water laver with 100 parts by weight of purified water. Fresh water laver spore is cultivated by adding 0.015 to 0.025 parts by weight of nutrient to 100 parts by weight of the culture solution, and injecting the mixture to a culture medium. An adhering material is injected to the culture solution in which fresh water laver spore has been cultivated. The fresh water laver spore attached to the adhering material is reared to the fresh water laver leaf body. The cultivation steps are as follows: the culture solution is maintained for 5 to 7 days in the condition that the flux is 50cm/sec, dissolved oxygen is 8.9mg/L, and irradiated light is 500 to 3000/Lux for 10 hrs a day at the temperature of 8.5 to 18.5 deg. C. The fresh water laver leaf body mixed with the culture solution is exposed to air once every 15 minutes during the cultivation. The rearing step is as follows: The step of exposing the fresh water laver leaf body attached to the adhering material to air every 15 minutes and adding a nutrient every 10 days is progressed for 3 months. The culture solution is maintained for 3 months in the condition that the flux is improved to 120 cm/sec and 500 to 7000/Lux of light is irradiated for 8 hrs a day. The nutrient includes potassium 80 parts by weight, magnesium 39 parts by weight, sulfur 91 parts by weight, boron 0.4 parts by weight, copper 0.6 parts by weight, iron 7 parts by weight, manganese 4 parts by weight, molybdenum 0.2 parts by weight, and zinc 0.2 parts by weight. [Reference numerals] (AA) Start； (BB) End； (S101) Culture solution preparation step； (S103) First rearing step； (S105) Adhering material injecting step； (S107) Second rearing step본 발명은 민물김의 양식방법에 관한 것으로, 더욱 상세하게는 정제수와 민물 김 엽체를 혼합하여 배양액을 제조하는 배양액제조단계, 상기 배양액제조단계를 통해 제조된 배양액에 영양제를 투입하고,
