Question: how to train your cat to walk outside?
Answer: Step 1: Get your cat used to wearing the harness indoors. Place the harness on your cat without the leash attached. ... 
Step 2: Get your cat used to walking on the leash (without tension) indoors. ... 
Step 3: Get your cat used to leash tension indoors. ... 
Step 4: Walk your cat indoors. ... 
Step 5: Go Outside.