I used the automatic grid layout plugin, and then the seam between the legs and body of this model became like this. Can someone help me please！！
I used the automatic grid layout plugin, and then the seam between the legs and body of this model became like this. Can someone help me please！！
Welcome 
…
i’m not sure about what…
…addon/extension you are talking about. But i seems like some retopology problem because there is some overlapping topology in the first place ??
You may have to elaborate this to get a more suited answer.
You can cut and recover the internal problem, and it will be more difficult if it is in a worse situation.
I’ll have to look at the file to find out the exact problem and recovery 
I made his body and legs separately and then combined them together. Then I used Boolean operations to remove the duplicate parts, but did not re link the topology of the two parts, Maybe I need to manually connect them together?
As far as i can see this is at the inner leg/crotch. But the problem arises more at the leg itself and not at the border between body and leg. So you may have to re-check this.
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ok, i will check it
The remesh density is far, FAR greater than it needs to be.
The boolean combine probably didn’t help you here, as i can see the seams between the torso and limbs isn’t clean.
And for what it’s worth - the body could be easily modeled with polygons and a subD modifier. You’d also get a clean mesh, and far fewer faces.
ETA: It’s also facing backwards in the world, so if you plan to rig this in blender you might wish to correct that. You are also using booleans on the face, for reasons that aren’t clear to me.
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Half of that modeling is almost fine.
There are only some mesh debris.
Remove this and mirror the half.
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Select object with L key in edit mode, reverse selection with Ctrl+I, and remove debris mesh
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Replicate half using mirror modifiers.
※ Adjustment is required because origin is off center.
It may also be a little problematic because the edges being joined are not symmetrical.
ssdg.blend (3.2 MB)
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An example for some “simpler” figure (arms still in t-Pose):
And the blend file in almost the same position as in original file (not perfect in the middle)… so appendable :
littleDogSimple.blend (132.7 KB)
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