NOVELTY - A sugarcane and Henry Steudnera tuber interplanting cultivating method involves performing land selection and soil preparation by selecting fertile, deep plowing, drainage and irrigation convenient land, ploughing land, applying triple compound fertilizer and calcium-magnesium phosphatic fertilizer and making furrow. Sugarcane and Henry Steudnera tuber interplanting step is performed followed by seeding, applying fertilizer, managing Henry Steudnera tuber field, managing sugarcane field, and controlling sugarcane pest.    USE - Method for cultivating sugarcane and Henry Steudnera tuber interplanting.    ADVANTAGE - The method enables cultivating sugarcane and Henry Steudnera tuber interplanting with improved sugarcane yield, improved cropping index, increased soil fertility, improved soil physical and chemical properties, improved sugarcane field ecological environment, reduced weed harms, improved drought-resistance ability of the sugarcane and good quality in cost-effective manner.    DETAILED DESCRIPTION - A sugarcane and Henry Steudnera tuber interplanting cultivating method involves performing land selection and soil preparation by selecting fertile, deep plowing, drainage and irrigation convenient land, ploughing land with tillage depth of 20-30 cm, applying 12-15 kg triple compound fertilizer and 30-35 kg calcium-magnesium phosphatic fertilizer and making furrow with wide of 145-155 cm and depth of 35-40 cm. Sugarcane and Henry Steudnera tuber interplanting step is performed by utilizing cattle plowing, planting sugarcane with every row line spacing of 80-90 cm. Seeding and fertilizer application processes are performed by planting sugar cane in late February, applying 1000-1100 kg, 25% fertilizer of nitrogen, phosphorus and potassium, 150-200 kg organic fertilizer and 120-140 kg/hm2 urea on land during March, applying 850-1000 kg/acre composting manure and 150-200 kg/acre organic fertilizer on land during late March, planting sugarcane in interplanted Steudnera reserved land and controlling seeding rate to 6370-7000 plant/hm2. Henry Steudnera tuber field managing process is performed by growing Steudnera seedlings in mid-May after topdressing 80 kg/acre urea and 125 kg/acre fertilizer, digging cast mulch and carrying out second top-dressing of 300 kg/acre fertilizer in mid-June before the enlargement of Steudnera. Sugarcane field managing process is performed by applying 125 kg/acre urea and 175 kg/acre fertilizer as tillering in late April and applying 175 kg/acre urea and 350 kg/acre fertilizer on sugarcane field in mid-March and applying stems fertilizer once in mid-June. Sugarcane pest controlling process is performed by preventing early May cane borer, spraying 70% carbendazim diluted to 2000 times in mid-July and preventing and controlling disease before harvesting.